Device for boring square holes.



PATENTED JAN. 10, 1905.

K. AUERBAGH. DEVICE FOR BORIHG SQUARE HOLES.

APPLICATION FILED FEB. 21, 1963. l

2 SHEETS-SHEET 1.

5] a uanYoz Kari Auarba/ch Silva mu witne'awo PATENTED JAN. 10, 1905.

2 SHEETS -SHEET 2.

@mwwtoz' filth-mm K. AUERBAGH. DEVICEPOR BURING SQUARE HOLES.

APPLIGATION FILED FEB. 21. 1903.

ter of much difiiculty by reason of its oscil- I do hereby which it pertains to make and .use it. refer- UNITED STATES Patented January 10, 1905 PATENT Fries.

KARL AUERBAOH, OF DRESDEN-PIESCH-EN, GERMr-KNY;

DEVICE FOR BORING SQUARE HOLES.

SPECIFICATION forming part of Letter Patent No. 779,517, dated January 10, 1905.

. Application filed February 21, 1903. Serial No. 144,516.

ence being had to the accompanying drawings, which form part of this specification.

In boring square holes the proper mounting and guidance of the drill is always amatlating motion in the pattern, whereby a continued demand is made upon fresh frictionsurfaces. of the drillingspindle; Attempts have been made to overcome this difliculty by securing the pattern to the work, or by employing a second pattern secured to the frame of the machine, or by arranging the apparatus to engage in the work, or by employing a drill sliding in a suitably-formed flange-ringor thelike running in the pattern. None of these methods, however, have been able to insure any really satisfactory guidance, especially in the case of badly-mounted spindles. This before all is due to the drill still being arranged to descend in the patternand to new friction-surfaces of the spindle always being acted upon, so that certain mounting andguidance of the drill is greatly interferedwvith.

At the same time the method of securing the pattern to the work is attended with the great disadvantage that the play of the drill cannot: easily be seen. The subject of my invention is adevice for attaching to the spindle of drilling-machines,

lathes, and the like for 'the purpose of boring square holes. The apparatus constitutes a self-contained tool in which the spindle and pattern always cooperate 'at the same part without motion relatively to each other--that is, instead 'of the drill sliding up and down in i the pattern the latter, with the complete tool, shares'the downward motion of the drill. For this purpose the casing containing the fixed or adjustable pattern is arranged rotatably on a member adapted to be secured to the spindle, and between the two, in a recess nn the under 2 surface of the inner member, is a disk, bridgepiece, or the like device carrying the drill, which device is guided with oscillating motion by means secured stationarily in the inner member. If the external casing is stopped while the inner member is in rotation, so that.

the latter carries with it the disk which sup ports the drill, the latter runs in the pattern in well-known manner without there being any motion, however, in the direction of the longitudinal axis. The descent of the drill into the work is effected solely bythe spindie in advancing carrying the whole apparatus with it. mounting and guidance of the drill is the simplest possible, and the latter can always be ex "actly observed in its motion. Further advantages attaching to this arrangement are, first,

that as soon as the outer casing is released and.

is therefore in rotation the oscillatory motion of the drill at once ceases, sothat instead of square holes round ones are drilled; second, that the shaft running in the pattern instead of having a drill-point can be secured in a fiat disk or the like for holding the work. The latter thus shares the rotary oscillating motion, so that work can be 'carriedout with a cutter or the like fixed in a holder. 3

The invention is illustrated by the annexed drawings, in which 7 Figure 1 is a vertical section of my new device. Fig. 2 is a horizontal section of the drill-shank. Fig. 3 is a vertical section of the lower portion of my device. in which the spindle is provided with a disk to hold the work. Fig. 4 is a horizontal section through Fig. 1 on the line at -1'= thereof. Fig. 5 is a vertical section, and Fig. 6 a horizontal section, both drawn to a lar er scale, of amodified construction of my device, the section being taken on the dotted line 6 6 of Fig. 5.

Referring more particularly to the construction shown in Figs. 1', -2, and i, u is the inner member, adapted to be attached toa spindle or the like and provided with two pins l). The latter engage in slots (7-, cut in a sliding disk (l, fitting into the space-n. The square pin f of the drill r engages in an aperture in the said disk 1/. 1/ represents ballrings. is the outer casing, in which is contained the Owing to this arrangement, the

stationary or adjustable pattern, and l: is a collar connecting the casing k with the inner member a. The collar can be adjusted by means of the counter-ring Z. m is a handle ioithe purpose of stopping the casing. hen this occurs and thespindle rotates with the member a, the pins 5. cause the disk d to re volve with the drill a, which now. runs in the pattern without motion in the dire tion of its longitudinal axis. -z -is a hollow ushing or tube held inthe casing and receiving the spindle. This is the pattern.

Fig. 3 shows the spindle is provided with a diskn (instead of .a' drill-point) for holding the work so as to enable an ordinary cutter to employed- I Referring now to the modified construction of my apparatus, (shown in Figs. 5- and 6,) the men iber-o is screwed to the spindle in well-known manner by means .ofja ring 1), at: tached by screws, whereby the device can be more readily applied" to any desired spin-' dle. Instead of pins'lg, provided in the memher a and engaging in slots of the disk (1, two fingers q are provided on a cross-piece 61*, a memberwcorresponding" to" said disk d, these -fingers.engaging 'inspaces r in the 'S'langes 3, provided below the member a", so that the crosspiece d- -is rotated with the i drill. The counter ring Zis dispensed with,

and the ring Z' connecting the member a with the casing 71. instead of being screwed to the latter is-screwed to the member a" and tightenedup .by a screw. It is provided with an angular rim f. on which rests the casing pu rpose of rigidly connecting casing and member 0 was to insure proper guidance of the drill. in boring circular holes. The'ring-u serves to b-ind the two bodies e and 11* fast together when pushed upon the apparatus.

Having thus described iny invention, what .i'claim as new, and desire to secure by Letters Fatent, is-

1'. In a device for attachment to the rotating spindle of square-hole-drilling machines,

the combination of an inner member rotating with the spindle, an outer casing for the pattern, the pattern in said casing, a spindle entering the casing, a device secured to said Spindle and located in a space between said inner member and outer casing, and means for causing rotation of the said device with the inner member and allowing it to partake of the oscillating motion of the spindle in the pattern, all substantially as described.

2. In a device for attachment tothe rotating spindle of square-'hole-drilling machines, the combination of an inner member rotating with the spindle, an outer casing for the pattern, the pattern in said casing, a spindle entering the casing, a device secured to said spindle and located in a space between said inner member and outer casing, means for earrying'the work attached to said spindle, and means for causing rotation of the said device with the inner member and allowing it to partake of the oscillating motion of the spindle in the pattern, all substantiallyas described.

3. In a device for attachment tothe rotating spindle of square-hole-drilling machines, the combination of an inner member rotating with the spindle,-an' outer casing for the pattern, the pattern in said casing, a spindle en: tering the casing, a dvicesecured to said spindle and located in'a space between said inner member and outer casing, ,means'for carrying the work attached to said spindle, means for "causing rotation of the said device withlthe inner member and allowing it to partake of the oscillating motion of'th spindle in the pattern, and means for rigidly attaching saidinner member to said casing for the purpose of adapting theapparatus for boring circular holes, all substantially as described.

:In witness whereof I have hereunto signed my name, this 29th day of January, 1903, in

- the presence of-twosubscribing witnesses.

KARL AUERBAOH.

Witnesses:

PA L E. SCHILLING PAUL ARRAS. 

